User interface for a display screen



FIG. 1 is a front view of a first embodiment of a user interface for a display screen showing my new design;

FIG. 2 is a front view of a second embodiment of the user interface for a display screen showing my new design;

FIG. 3 is a front view of a third embodiment of the user interface for a display screen showing my new design;

FIG. 4 is a front view of a fourth embodiment of the user interface for a display screen showing my new design; and,

FIG. 5 is a front view of a fifth embodiment of the user interface for a display screen showing my new design.

The environmental broken line showing of a display screen is not claimed. 

The ornamental design for a user interface for a display screen, as shown and described. 